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From Wikipedia, the free encyclopedia

XB-27
Role High-altitude medium bomber
National origin United States
Manufacturer Glenn L. Martin Company
Developed from Martin B-26 Marauder

The Martin XB-27 (Martin Model 182) was an aircraft proposed by the Glenn L. Martin Company to fill a strong need in the United States Army Air Corps for a high-altitude medium bomber. Its design was based approximately on that of Martin's own B-26 Marauder. The XB-27 remained on paper, and no prototypes were built.

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  • ✪ Why Was This Plane Invulnerable: The SR-71 Blackbird Story
  • ✪ Fastest Aircraft Ever Exist Maximum Speed Comparison 3D
  • ✪ China shocked: US Air Force Builds 200 B-21 Stealth Bombers

Transcription

Thanks to SquareSpace for making this video possible and for helping launch my new Mustard store. More on that after this video. In the midst of the Cold War, two Mig-25s race to intercept a threat along the Soviet border. They're the fastest interceptors ever built, and if they really push their engines, they can reach an incredible Mach 3.2. But it's not enough. Because what they're chasing can outrun and out-climb any threat. A plane engineered to be invulnerable. The Cold War locked the United States and Soviet Union into a tense a struggle for global influence and control. Both sides poured enormous resources into military technologies. But getting an upper hand means knowing your opponent's next move. And in the 1950s, little was known about facilities deep within the Soviet Union. An extensive network of radar stations, surface-to-air missile sites, and interceptor air bases kept the Americans away. Until 1956, when U-2 spy planes began flying over the Soviet Union. Neither fast nor stealthy, the U-2s had one critical advantage. At 70,000 feet, they could fly above Soviet air defenses. U.S. President Eisenhower was even assured, Soviet radars couldn't detect the U-2 at such high altitudes. But it turns out, the Americans were wrong. The Soviets had tracked the U-2 since day one, and it was only a matter of time before they'd be able to shoot one down. Simply flying high wasn't enough. Even before the U-2 began its surveillance missions, there were already plans underway to replace it. Because true impunity over Soviet airspace would need a combination of incredible speed, altitude, and stealth. And this led the Americans to explore some pretty radical spy plane concepts, like a ramjet powered aircraft that would be deployed from the bottom of a supersonic B-58. But in 1959 the CIA chose Lockheed to develop the next generation of spy plane. Meanwhile, the U-2 continued to fly over the Soviet Union. But not for very long, because in the spring of 1960, a Soviet surface-to-air missile finally managed to bring one down. The captured pilot and wreckage were paraded around the Soviet Union used as proof of Western aggression. As tensions rose, now more than ever the US needed a replacement for the U-2. And what Lockheed developed, would be unlike any aircraft ever built. A plane that nearly 60 years after its first flight, remains the fastest air-breathing jet to ever fly. Lockheed's highly-classified spy plane would be known as the A-12. Originally used by the CIA for reconnaissance, the A-12 was also developed into an interceptor prototype, armed with air-to-air missiles, along with a variant that could launch an unmanned reconnaissance drone. But it was the SR-71 Blackbird, a variant developed for the Air Force that would go on to serve for decades, while earlier versions were quickly retired. The Blackbird could cruise at Mach 3.2 right near the edge of space, and do it for hours on end. To achieve this, Lockheed's engineers had to innovate pretty much everything from scratch. To sustain such incredible speeds the SR-71 and its predecessors were powered by engines often described as turboramjets. Below Mach 2 they functioned like conventional after-burning jet engines. But above that, they behaved more like ramjets, as an inlet cone adjusted to bypass air around the engine and directly into the afterburner. At mach 3.2 the SR-71's exterior would heat up to beyond 500 degrees Fahrenheit, easily hot enough to soften aircraft aluminum. Lockheed engineers used titanium for 92 percent of the aircraft, and in the 1960s this required inventing entirely new fabrication technologies. It's unusual shape did more than just spook UFO enthusiasts, it helped reduce its radar signature as did its special black paint, which earned the SR-71 its Blackbird name. The A-12 and SR-71 were first deployed over North Korea and Vietnam, where they were unsuccessfully targeted by over 800 surface-to-air missiles. But the spy plane never flew into Soviet airspace. At least not officially, because another shoot-down over the Soviet Union would be catastrophic. So instead, the SR-71 flew along its borders, using its powerful side-looking radar and cameras to peer hundreds of miles into Soviet territory. And that frustrated the Soviets. In 1976, Viktor Belenko defected to the west, by escaping the Soviet Union in his Mig-25. He described the frustration of trying to intercept Blackbirds. The MiG's were Mach 3 capable, but only for a few minutes at a time. Not for hours like the Blackbird. Nor could they climb to reach the SR-71's incredible altitude. Even their enormous R40 missiles lacked the guidance needed to strike the SR-71 head-on. For years, the Blackbirds were practically invulnerable. They could out fly and out-climb any threat. But by the 1980s, Mig-31s were roaming the skies, equipped with sophisticated radar and long-range R33 missiles. They posed a legitimate threat, as did a new generation of Soviet surface-to-air missiles. But the greatest threat to the Blackbird wasn't an enemy missile or jet. It was itself. No Blackbird was ever lost on a mission, but more than a third of the 50 built were destroyed in accidents. One literally disintegrated around its pilots. They were also enormously expensive to operate. Each one siphoning about 300 million dollars a year out of America's defense budget. A fleet of special aerial refuelers and a small army of support and maintenance staff were needed just to keep these planes mission ready. And advances in spy satellites aerial drones and the SR-71 s inability to deliver surveillance data in real time, diminished some of the plane's utility. Add to that, politics and infighting for defense budgets and by the late 1980s, the SR-71's days were numbered. They were officially retired in 1998, with two sent to NASA for testing. The technology behind the A-12 and SR-71 is now well over fifty years old. Yet somehow these incredible planes still speak to us. Not about the past, but the future. Leaving us with a sense of wonder unlike any other in aviation history. A few months ago, I launched my Mustard site with SquareSpace. It was fun, easy, and I did it literally in a few hours. But now it's time to take it to the next level. Using SquareSpace's incredibly easy and intuitive e-commerce features, I just launched the Mustard online store. With SquareSpace's seamless integration with Prtintiful, it took me only a few hours to get up and running. Be sure to check out the store, and let me know if you have any requests for Mustard swag. From start to finish, using SquareSpace has been incredibly seamless, intuitive, and fast. Whether you're a photographer, blogger Youtuber, or run a small business, make your next move with SquareSpace's all-in-one platform. Start building your website for free at squarespace.com/mustard, and when you're ready to launch your website, use the code Mustard for 10% off your first purchase.

Specifications (as designed)

Data from [1]

General characteristics

  • Crew: 7
  • Length: 60 ft 9 in (18.52 m)
  • Wingspan: 84 ft 0 in (25.60 m)
  • Height: 20 ft 0 in (6.10 m)
  • Powerplant: 2 × Pratt & Whitney R-2800-9 , 2,000 shp (1,500 kW) each
  • Propellers: 4-bladed constant-speed propellers

Performance

  • Maximum speed: 280 mph (451 km/h; 243 kn)
  • Range: 2,900 mi (2,520 nmi; 4,667 km)
  • Service ceiling: 33,500 ft (10,200 m)
  • Power/mass: 0.12 hp/lb (0.20 kW/kg)

Armament

  • Guns:
    • 3 × .30 in (7.6 mm) machine guns
    • 1 × .30 in (7.6 mm) machine gun
  • Bombs: >4,000 lb (1,800 kg)
  • See also

    Related development

    Aircraft of comparable role, configuration and era

    Related lists

    References

    1. ^ Heyman, Jos (2015). UNITED STATES MILITARY AIRCRAFT : Air Force : B=Bomber.


    This page was last edited on 4 June 2019, at 05:26
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